Added a very minimalistic SMTP client to send mails via a local Exim

src/libfast/smtp.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup smtp smtp
+ * @{ @ingroup libfast
+ */
+
+#ifndef SMTP_H_
+#define SMTP_H_
+
+typedef struct smtp_t smtp_t;
+
+#include <library.h>
+
+/**
+ * Ultra-minimalistic SMTP client. Works at most with Exim on localhost.
+ */
+struct smtp_t {
+
+	/**
+	 * Send an e-mail message.
+	 *
+	 * @param from		sender address
+	 * @param to		receipient address
+	 * @param subject	mail subject
+	 * @param fmt		mail body format string
+	 * @param ...		arguments for body format string
+	 */
+	bool (*send_mail)(smtp_t *this, char *from, char *to,
+					  char *subject, char *fmt, ...);
+
+	/**
+	 * Destroy a smtp_t.
+	 */
+	void (*destroy)(smtp_t *this);
+};
+
+/**
+ * Create a smtp instance.
+ */
+smtp_t *smtp_create();
+
+#endif /** SMTP_H_ @}*/